/*
 * Copyright (c) 2012 Johan Fylling
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy 
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights 
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
 * copies of the Software, and to permit persons to whom the Software is 
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 * THE SOFTWARE.
 */

part of engine;


class Camera extends DynamicBody {
  num                       _scale     = 1.0;
  num                       _scaleInv  = 1.0;
  
  Camera () {
    this.collidable = new CollidableRectangle(new Vector2(100, 100));
  }
  
  CollidableRectangle get rectangle => this.collidable as CollidableRectangle;
  
  num get scale => this._scale;
  
  void set scale (num scale) {
    this._scale = (scale >= 0 ? scale : 0);
    this._scaleInv = (scale != 0 ? 1.0/scale : 1.0);
  }
  
  num get scaleInv => this._scaleInv;
  
  num get widthWorld => this.rectangle.halfSize.x*2;
  
  num get heightWorld => this.rectangle.halfSize.y*2;
  
  num get widthCanvas => this.rectangle.halfSize.x*2*this._scale;
  
  num get heightCanvas => this.rectangle.halfSize.y*2*this._scale;
  
  Vector2 canvas2world (Vector2 point) {
    return point*this.scaleInv + (this.position - this.rectangle.halfSize);
  }
  
  Vector2 world2canvas (Vector2 point) {
    return (point - this.position + this.rectangle.halfSize)*this.scale;
  }
}
